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NedStarkOfWinterfell · Answer 1 · 2018-09-28T19:20:48+0000

The length of an arc is formulated by the formula:
$l = r\theta$ , provided
$\theta$ is in radian form.
Thus, the length can be easily solved by substituting all that you need to know:

$l = 15.2((3\pi)/(4))$

$l = (45.6\pi)/(4)$

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